what are jumpers on Hitachi SATA disk?

I have 3 Hitachi Deskstar SATA disks. There are two pins next to the
data and power connectors that take a jumper, as used on IDE disks.
In the old days, many drives had a jumper to limit them to 32 GiB
or 8 GiB. I doubt that applies today, when the smallest for sale is
something like 500 GB. I have seen some disks with a jumper to slow
them to SATA 1.5 for PCs that do not handle the faster rate.
I have looked on Hitachi website and downloaded a few datasheets,
but they do not mention this jumper option.
So what is it?

In message someone claiming to be "Orson Cart"
typed:


I have 3 Hitachi Deskstar SATA disks. There are two pins next to the
data and power connectors that take a jumper, as used on IDE disks.
In the old days, many drives had a jumper to limit them to 32 GiB
or 8 GiB. I doubt that applies today, when the smallest for sale is
something like 500 GB. I have seen some disks with a jumper to slow
them to SATA 1.5 for PCs that do not handle the faster rate.
I have looked on Hitachi website and downloaded a few datasheets,
but they do not mention this jumper option.
So what is it?

It might not be documented, or only for factory use. I haven't looked,
but it's also possible that it's for directly connecting an activity
LED, the odd drive has this capability (although admittedly it's the
sort of thing that would probably be documented)

It might not be documented, or only for factory use. I haven't looked,
but it's also possible that it's for directly connecting an activity
?LED, the odd drive has this capability (although admittedly it's the
sort of thing that would probably be documented)


Ignore those pins, they are for factory use only